Telephone-signal.



C. L. 'CH-ISHOLM. 'I`EI.|EPI'I0I'- SIGNAL. ABPLIUATION FILED SEPTJ, i909.

986,267. Patented Mar.7,1911.

j; J5' a3 A To all whom 'it may concern:

PATENT onirica.

TELEPHONE-SIGNAL.

' Be it known that I, CHARLES' L. CHIS- vHOLM, avcitize'n 'ofthe United States, residingdat 'Marysville, in the Province of New Brunswick, Canada, have invented new and useful Telephone-Signals, of which the following is a specification. Thls invention has reference to improvements v1n telephone s1gnals and 1s designed to condense and simplify telephone sets to a minimum of Weight and space.

The present invention is designed to utilize-the mouth-pieces of 4telephonie transmitters for the production oi' call signals by making these mouth-pieces of resonant materialsuch as bell metal and so locating therringing lmagnets that they will cause the actuation of a suitable striker in operative relation lto the mouth-piece so as xto cause the latter to resound after the man ner of the signalbells usually employed in connection vwith telephone sets.

ABecause of the utilization of the mouthpiece of thetransmitter aj signal bell, tendency of lthe lgranular material in the microphonic element of the transmitter to pack iscounteracted each time a signal is received, .and consequently the. transmitter retains at all times its highest cfliciency. By providing a signal bell as described in connection withla microphonic transmitter of minute size such as described in application No. 482,212 filed by me on March 9, 1909, for a telephone transmitter, the desk sets commonly Aemployed may be greatly simplified and condensed as well as made light inv weight without detracting from their utilityvorvsacrilicing any of the adyanta ees inherent in such telephone desk Sets ,i y i' l/Vith respect. to the signal side of the -present invention it is not of necessityV limited to a Atelephone transmitter butmay be used in lconnection with any mouthpiece designed to transmit sound whether the transmission bey through the mouth-piece from the wide end'toward thc small Lend or the reverse, especially where it is desirable to transmit signals.

The invention will be best understood from a consideration of the following de tail ldescription taken in connection with the accompanying drawings forming a part of this specification, in which drawings,-

F-igure l is an elevation of a desk telephone set rwith the invention applied and Specification of Letters Patent.

Patented Mar. 7, 1911.

Application filed September 7, 1909. Serial No. 51Q,412.

of telephone set of this character. Fig. 2 1s .an elevation ona larger scale of the transmitter end of the structure shown in Fig. 41. Fig. 3 shows a modification.

lVith the understanding that the invention is by no mcans'limitcd to the utilization of the mouthpiece of a microphonic transmitter as thc sounding member of the signal apparatus, butmay be used in any following description will for the purposes ot' simplifying the description be confined to the application of the invention to the mouth-piece of a microphonic transmitter.

Referring to the drawingsl there is shown a 'transmitter l which may be constructed on the general lilies disclosed in the aforesaid application, but since the specific coninto the present invention, the description and showing of the same has been omitted.

The transmitter is shown as mounted on' one end of a curved arm 2 returned on itself and joined at 3 to an upright stem t rising :from a pedestal 5 mounted on an extended base 6, 'the pedestal 5 and base 6 being similar to the like parts found in commercial types of desk sets. The pedestal 5 may nisin controlled by the usual telephone hook i designed to receive. and support a receiver 8 which latter may be of the usual type and is therefore only illustratiif'ely shown in the drawings.

less height than usual so that the mouth end of the receiver 8 when sustained by the hook l is in close relation to the table'or other support upholding the base 6, this arrangement bringing the center of gravity of the device very low andymaterially improvv ing the steadiness thereof This steadiness lis further limproved bythe fact ,that the transmitterstructure isve'ry small .and very i light so', ythat theftcenter of gravity of the r entire deviceis nearly ,th-esame whether the transmitter bev present or absent.`

It is often desirable that the transmitter' be tilted at different angles and for this purpose the junction 3 may be in the form of a hinge such as is usually employed for mounting the transmitter of the commercial type of desk sets. Y

The transmitter 1 is provided with a mouth-piece 9 of the flaring type, this showing the simpliiied and condensed form' struction of the transmitter does not enterl contain,` as is usual, the switching mechaconnection in which it may be adapted, the

The, standard or `pedestal' 5 is made of mouthpiece being materially shorter than the mouth pieces ordinarly employedin connection with transmitters and consequently the interior of the mouth piece may have a more pronounced flare since .the outer or wider end of the mouth piece shouldv be of about the same diameter as that of the mouth pieces ordinarly in use. Y

For the purposes of the present invention the mouth piece 9 is made of resonant material, preferably bellr metal, and when made of the last named material, it maybe suitably vpolished and metal plated.

head 13 1n suitable relation toene side of the bell. 9 so that .when the signal current traversesthe circuit the magnet 10 will be energized and the armature 11 will rock upon its pivot in responseto the varying currents of the line and the head 13 will be caused to strike a rapid. succession of blows against the outer. face of the bell mouth piece 9'. Of course in practice alight protecting casing may be provided for the magnets 10, but this may be made very light and will not add materially to the `I veight of the structure.`

'I`here are numerous Ways in which the transmitter may be supported but the small size of the transmitter described'in theafo're said application makes it particularly adapted'for all types of support with the mouth piece constituting the signal bell and lwith rthe bell operatingV magnet adjacent'to' the transmitter.

lVhen the invention is used in connection with transmitters of the ordinary commercial form, the bell actuating magnet may be mounted on the transmitter casing in various Ways which need not be specically referred to.

It Will be observed that the transmitter mouthpiece When constructed inl accordance with the present invention performs three functions. mouthpiece of directing thesounds Aagainst the transmitter diaphragm. Another of giving the usual telephone signal.l Another is to cause the agitation of the granules in the microphonic element each time the signal is given and so prevent these granvOne is that of the ordinary is that 5 ules from packing and thereby maintaining the most eilicient condition.

vIn Fig. opposite sides of the support 2 directly back of the transmitter and strikers 13 are carried on each end`of the armature.v This gives a -very compact structure.

l. An acoustical instrument having a mouth-piece Aconstituting the sounding side of an audible signal, and` means for setting the mouth-pieceJ into vibration to cause a signal.

2. A mouth-piece constituting the sounding side of an audible signal, and means for setting the mouth-piece into vibration to cause a signal.

tallic mouth piece and means coacting therewith to cause an audible signal.

4. A telephone transmitter having a mouth piece constituting the sounding member of an audible signal, and an electrically actuated striker in operative relation to said vmouth piece.

5. A telephone desk set comprising a suitable support, a receiver and transmitter on said support, and a signal means consisting of a mouth-piece for the transmitter, a striker for said mouthfpiece, and electromagnetic means or actuating the. striker and also carried by the support.

6. In telephones, a microphonic transmitter, a signal means, and electric operating means for said signal'means in de-packing relation, to saidtransmitter.v

7. In telephones, a microphonic transmit-ter, and a call-receiving means in depacking relation to` said microphonic transmitter. 'v v 8. In a telephone, a microphonic transmitter, a supporting larm therefor, and a call-receivingvmeans mounted on said arm element of the transmitter.

9. In a telephone, "a microphonic trans- .mitter, a pivoted supporting arm therefor, and a call-receivingmeans also mounted on said arm in tie-packing relation to the micros phonic element of the transmitter.

" In testimony thatY I claim the vforegoing as my own, I have heretoailixed my signature in the presence of two witnesses'.

CHARLES L. cHrsHonM. -VVitnesse's E. Hiram '.TALnnR'r, F. T. CHAPMAN.

3. A telephone transmitter having al mein de-packing relation to the microphonic 3, the magnets are arranged Aon telephone transmitter having a' ies 

